There are renewed questions over the practicality of air-conditioning Doha's Khalifa Stadium. Photograph: Karim Jaafar/AFP/Getty Images

The leader of Doha's well-funded bid for the 2017 World Athletics Championships is banking on its ability to invest in the development of the sport to overcome the rival London offer.

Both bidders will deliver their final presentations in Monaco on Friday to the 27 members of the International Association of Athletics Federations Council, who will make a decision with far reaching implications for the legacy of London 2012 and the future of the Olympic Stadium.

Sheikh Bin Abdulrahman al-Thani, secretary general of the Qatar Olympic Committee and chairman of a Doha bid that has already promised to cover the £5m prize fund so the money can be ploughed into other IAAF initiatives, said: "I think tomorrow we will make more of the future, make more of working with the IAAF on development. I think that will make the difference.

"We know that they have a lot of development programmes across all five continents. This could be going to the youth, making athletics tracks in the regions that are in need of them. We leave that to the IAAF. We will cover the prize money from our side and it is up to them how they choose to use it."

Despite renewed questions from stadium design experts over the practicality of air conditioning the 40,000 capacity Khalifa Stadium in Doha, al-Thani said that he was convinced its bid had managed to allay concerns about the heat.

"I think that when the evaluation committee were in Doha, they witnessed the first generation cooling system that we developed four or five years ago. Now we are working on the second generation, which will be solar powered.

"We are offering a solution not only for Qatar but for the region. Some countries face cold weather, some face hot weather. Some countries need heaters in the roof, they are looking for a solution for the cold weather."

The Qatari bid, part of an ambitious development programme with sport at its core that has already secured the 2022 World Cup in controversial circumstances and encompasses a bid for the 2020 Olympics, proposes to move the world championships to late September in order to avoid the worst of the heat.

But temperatures could still top 40 degrees Celsius and the marathon and race walk will be held late at night under floodlights along Doha's dramatic waterfront.

"We are offering a solution for the IAAF but we are also saying that the end of September, beginning of October is not like July or August. The end of September and beginning of October are like summer in other cities," said al-Thani.

He said that international sports federations should be prepared to be flexible if they wanted to take their events into new territories. The Doha 2020 Olympic bid also proposes to move the Games to late September and early October.

"Once you want to go to new regions and make your sport global, you have to be flexible. To go to new regions and new audiences and develop the youth, you have to be flexible. In 2000, Qatar already hosted the final Grand Prix at the end of September, after the Sydney Olympics," he said.

The UK Athletics chairman Ed Warner has called the £5m investment in the prize fund "modest" compared to the sum that London could generate for the IAAF in sponsorship and commercial opportunities.

But al-Thani insisted that a championship in Doha could also be attractive to commercial partners and pointed to the number of local partners that could be persuaded to invest.

"This is a region that has not been yet developed by the IAAF. We have more than 450m people living in that region with an age under 30, which is huge," he said.

Like Lord Coe, the London 2012 chairman who also sits on the IAAF Council as one of four vice presidents, al-Thani ruled out the prospect of accepting the consolation prize of the 2019 championships. There had been renewed speculation that the IAAF may look again at the idea of awarding both championships at the same time.

"2017 falls within our strategy and we have made that clear to our bidding committee and the IAAF."

He refused to comment on the continued uncertainty surrounding the future of London's Olympic stadium but pointed to the "certainty" that Doha's bid offered.

"People know that we deliver. We when we do an event, we will deliver in the right way," he said.

And he countered claims that Doha would struggle to fill its stadium with knowledgable, passionate fans and would prove unpopular with athletes by pointing to full stands for the 2010 world indoor championships and saying it was working on plans to make it easier for fans from around the world to attend.

"We already have the know-how. We are working with IAAF, with the social media and social networks on how to being fans from all over the region and all over the world. That is something we want to introduce so that there is not only the majority of people from the country but from all over the world, making initiatives for people to be in the country," he said.